Oil burner



Nov. 27, 1956 H. J. WISER, SR

011. BURNER 2 Sheets-Sheet 1 Filed Feb. 20, 1952 INVENTOR.

HUBER? J W/see SA.

ATTORNEV Nov. 27, 1956 H. J. WISER, SR

OIL BURNER 2 Sheets-Sheet 2 Filed Feb. 20, 1952 INVENTOR HUBEAT J M55:5&-

Mb On 3 M u mHH 1, 0o zvm HTTOIPIV V United States Patent O OIL BURNERHubert I. Wiser, Sr., Bloomington, 111., assiguor, by mesne assignments,to Henney Motor Company, Inc., New York, N. Y., a corporation of NewYork Application February 20, 1952, Serial No. 272,540

4 Claims. or. 158-363) This invention relates to oil burners and hasparticular reference to oil burners of the low pressure type in whichoil and air are supplied under relatively low pressures to an oil andair mixing nozzle, which nozzle mixes the oil and air therein anddischarges a mixture of finely divided particles of oil and air into astream of secondary air which flows past the nozzle.

A principal object of the invention is to provide a new and improved oilsupplying means for an oil burner.

A further object of the invention is to provide a new and improved oiland air pumping unit for an oil burner.

Other and further objects of the invention will be apparent from thefollowing description and claims and may be understood by reference tothe accompanying drawings, of which there are two sheets, which by wayof illustration show the preferred embodiment of the invention and whatI now consider to be the best mode in which I have contemplated applyingthe principles of my invention. Other embodiments of the invention maybe used without departing from the scope of the present invention as setforth in the appended claims.

In the drawings:

Fig. 1 is a schematic view of the air and oil pumping unit of an oilburner embodying this invention.

Fig. 2 is a continuation of Fig. 1 and schematically illustrates certainother portions of the oil burner disclosed in Fig. 1.

The oil and air pumping unit disclosed in Figs, 1 and 2 comprises ingeneral an air supply pump 10, an oil supply pump 12, an oil meteringpump 14, and an oil and air mixing nozzle indicated generally at 16adapted to be supplied with oil and air under relatively low pressuresfrom the oil and air pumps 14 and and to discharge such oil and air inthe form of a spray of finely divided oil particles and air into astream of secondary air supplied through an air tube 17 past nozzle 16by a blower or fan 18 so as to form a combustible mixture of oil andair. The air and oil pumping means are mounted on and arranged to bedriven by a shaft 20 which may be suitably coupled to the shaft of anelectric motor (not shown) and blower 18 may also be driven by suchelectric motor.

The air pump 10 is of the rotary sliding vane type and includes a rotor22 secured to shaft 20 so as to rotate therewith within an eccentriccylinder 24. The rotor 22 is provided with a series of radial slots ineach of which is arranged a sliding vane so that upon rotation of rotor22 air will be drawn in through the air inlet 26 and discharged fromoutlet 28. The casing or housing 30, which houses the air and oilpumping unit, is provided with air inlet openings 32 communicating withan air intake chamber 34 which communicates with inlet 26 to air pump 10through a filter indicated generally at 35.

Oil from a suitable supply tank is supplied to a filter chamber 36through port 38 and through a filter 40 to a pipe 42 which communicateswith a conduit 44 leading to the inlet 46 of oil supply pump 12. Thepump 12 is of the gear type and includes a pair of intermeshing gears,one of which is mounted on shaft 20 to rotate therewith 2,771,943Patented Nov. 27, 1856 "ice by means of a ball 48 arranged in an axialslot in the gear and in a depression in shaft 20. The pump 12 isprovided with an outlet 50 adapted to supply oil through conduit 52 intoa chamber 54 in valve body 66 on one side of a flexible diaphragm '56connected to a normally closed valve means 58, the valve means 58 beingmovable "with diaphragm 56 under the influence of spring 60 and inresponse to difierences in pressure on opposite sides of such diaphragm.

The normally closed valve member 5'8 is slidably arranged within asleeve 62 secured within a passage or valve chamber 64 provided in valvebody 66. The valve 53 includes an opening 68 therethrough adapted tocommunicate with chamber 54 when the valve is in the open positiondisclosed in Fig. 2. A central passage 70 in valve 58 provides acommunication between chamber 54 and a chamber 72 on the opposite sideof diaphragm 56. A'passage 7-4 communicates with chamber 72 in valvebody 66 and also communicates with an annular chamber 76 formed in acentral block 78 of the pumping unit.

Chamber 76 communicates through passages 80 and 82 with metering pumpchamber 84 in which the metering pump 14 is arranged.

Metering pump 14 includes a metering pump rotor 86 driven 'by shaft '20by means of a pin 88 secured within a radial opening in rotor 86 andhaving its inner end arranged between the bifurcated ends of shaft 20,the end of shaft 2%) extending through an axial opening provided inrotor 86. Rotor 86 is provided with a pair of metering pump cylinders 90and 92 separated by a fixed plug 94. A piston t 96 is reciprocallyarranged in each of the cylinders 99 and 92 and each of the pistons 96is provided with a cross arm 98 between which cross arms 98 suitablespring means (not shown) may be provided for biasing the pistons 96 awayfrom each other and against the inner wall of a sleeve 100 which iseccentrically arranged relative to rotor 86 so that upon rotation of therotor 86 the pistons 96 will reciprocate within their respectivecylinders so asto effect the intake and discharge strokes ofmeteringpump 14. A ball 102 is arranged in a depression in the bifurcated end ofshaft 20 and is seated within a central recess in rotor '86 forproviding a thrust bearing member between shaft 20 and rotor 86 and forcentering the rotor relative to the shaft.

The end face 105 of rotor 86 is lapped and seats and rotates against asimilarly lapped face provided on the end block 107. As shown in Fig. 1the lower piston 96 at the end of 180 rotation have completed itsdischarge stroke, while the other piston would have completed its intakestroke. The eccentricity of sleeve 100 relative to rotor 84 may beadjusted by means which comprises a threaded plug 109 having a camsurface 111 adapted to I engage a ball 113 which engages the outersurface of sleeve 100 so that the eccentricity of sleeve 100 will beadjusted by adjustment of threaded plug 109.

Oil is supplied from metering pump chamber 84 to intake port 104 throughpassage 106 and is discharged from the metering pump through outlet 108and conducted by means of passage 110 to the passage or valve chamber 64in valve body 66. The valve means 58 is provided with a valve member 112which is slidably arranged within a bore 114 which communicates withvalve chamber 64. Valve member 112 has a central passage 116 opening atone end thereof and adapted to communicate with valve chamber 64 throughan opening 118 when the valve means 58 is in its open position as shownin Fig. 2. Valve member 112 is secured to and moves with valve member58. The outer end of passage 114 in valve body 66 communicates by meansof conduit 120 with a pipe 122 for supplying C r I 7 x3 oil to nozzle16. When the valve 58 is open, with the 7 opening 118 in valve member112 exposed withincha'mber' 64, metered quantities of oil are suppliedto nozzle 16 from the metering pump 14 through passage 110, chamber 64,

passages 118 and-116, conduit 120, and the pipe 122.

The primary air discharged through outlet 28 of air J pump 10 isdelivered through passage 124 to conduit 126 g which communicates withthe interiorof apipe 128which indicated generally at 130 are providedfor igniting the combustible mixture'of oil andair discharged from thenozzle; 7 V

' A by-pass is provided between the inlet and the outlet of the 'oilsupply pump 12 and such by-pass includes a normally closed valve meansprovided by the valve member 58, and an annular restricted passage 140which is. defined between the shaft 21 and the central bore in the rotor86, thereby creating a pressure diiferential between the inlet andoutlet of the pump. The end of shaft 20, which extends through the gearpump 12 and the rotor86,

,is hollow, and a transversepassage 142 provides a communication betweenthe interior of shaft and seal cham-' her 144. The by-pass betweentheinlet and outlet of pump 12 includes passage 52, chamber 54, passages68 and 70 in valve member 58, chamber 72, passage 74, annular chamber76, passages 80 and 82, the restricted passage V140, the interior of thehollow'end of shaft 20, transverse 7 passage 142 in shaft 20, sealchamber 144, and passage 146 which may communicate with either thefilter chamber 36, as shown, or with the fuel supply tank in the eventthat plug 143 is removed and the threaded opening at the 7 upper end ofpassage 146 is'closed.

All of the oil'discharged by'the supply pump 12 flowsthroughpa'ssage52and into chamber 54 where it exerts a fluid pressureagainst diaphragm 56 tending to move valve member 58 against the forceof spring 60 into the *-open' position thereof shown in Fig. 2. Thenormally closed valve means 58 may be set to open when a predeterminedpressure exists in the by-pass', which might be inthe neighborhood of;sevenor'eight'pounds per'square inch, although the pressure at whichsuch valve will open may be set at any suitable value. Valve 58'regulates the pressure at which oil must be supplied by pump 12 beforevalve 112 will open and permit theflow'of oil to nozzle 16. Valve 58will close when the pressure in the bypass falls below the predeterminedvalue, and valve 112 will therefore close at such time thereby shuttingoff the flow of onto the nozzle.

It will be seen that the inlet tometering pump 14 is arranged betweenthe normally closed valve means 58 and the restricted passage 140, andthat oil will be supplied to themetering pump inlet only when the valvemeans i 58 is open. Since valve member 112 will always be in its openposition with passage .118 exposed within valve chamberf64 when valvemember '58 is open, metered quantities of oil willbe supplied'thr'oughthe normally closed vaive112 to nozzle '16 at such time. The restrictedpassage 140 permits the flow of,oil from passage 82'into the hollow endof shaft 20 and through passage 142 into chamber 144, and throughpassage 14610 ,thesupply tank I in ion dischargad by Said pump andopened at at orio the filter chamber, The size of the restricted passage143 is such "as to create a resistance to the flow of oil 7therethrou'gh in an amount sufiicient to maintain the pie-- determinedpressure in the by-pass during normal operation'of the pump 12 so thatvalve 58,'and valve 112, will remain open. The passage v140 permitsquantities of oil in excess of that required or handled by the meteringpnrnpto flow. through the by-pa'ss and back to the supply tank.

The shaft 20 is adapted to rotate in bearings 160 and "162 ,and arunning seal indicated generally at 164 is mounted on the shaft forpreventing the flow of oil from the seal chamber 144, to the-left alongthe shaft from such chamber. a

The valve member '112 is arranged within passage 114 7 with a fitsufiiciently loose so that minute. quantities of" oil may flow along theouter surface of valve member 112 and'into passage 170which communicateswith'the inlet 26 to air pump 10 so that small quantities ot; oil wilhhedrawn into the pump 10 .for lubricating the same mater improving theefliciencythereofxqSuch small quantities of oilsas are drawn into pump10. will'be discharged therefrom,'together with air, through passage124'to nozzle 16. '15

A pressure regulating valve 172 vgo'mnm'nicates with passage 124 andwith passage 170 and regulates the pressure 8 at which 'air is suppliedby air pump 10. r

avail myself of such changes and alterations as fallwithin the purviewof the following claims.

'I claim:

1. An oil burner comprising an oil pump having an' inlet and an outlet,a by-pass between said inlet and outlet, normally closed valve meansand-a restricted passage in said by-pass in the order named andoperative to resist flow-of oil therethrough during "operation of saidpump thereby to create a pressure diiferential between said inlet andoutlet, a fuel metering device having its inlet connected to saidby-pass between said valve means and said restricted passage so as to besupplied with oil froms'aid.

' pump when said valve means is open, a nozzle connected to said;metering device so as to be supplied with oil therefrom, and a normallyclosed valve in the connection between 'said nozzle and saidmeteringdevice, said valve Y being connectedto said valve means andmovable there with so as to be opened by opening movement .of said valvemeans.

2.'An oil burner comprising an 011 pump having an inlet and an outlet, abypass betweens'aidinletiand outlet, 7 V nonnally'closed valve meansanda'restrictedpassage in said by-pass in the order named and operativeto resist flow of oil therethrough during operation of said pump therebyto create a pressure differentialbetween said inlet and outlet, an onatomizing nozzle connected to said, by-pass between said valve means andsaid restricted'pas sagesonas to be supplied with oil from said pump:when;

said valve means is open, a normally closedvalve intheconnection-between said nozzle and said by-pass and connected to saidvalve means so as to' be openedgby opening movement of said valve means,said valve means being opened in response to a predetermined pressurein. satd y-p s -fi t s r 3- .An oil urner comp si g an o l p mp h ing aninlet and an outlet,'a by-pa ss between saidinlet and outlet,

normally closed valve means ,in said by-pass, a nozzle '1 connected tosaid by-pass downstream from said valve means so i as to be suppliedwith oil from said pump when said valve means is open, a normally closedvalve in the connection between said nozzle 'and said byepfis's, saidvalve means and valve being responsive to the p e sure an oil :atomizingnozzleconnected to said by-pass between valve means andsaid restrictedpassage so as :to be supplied with oil from said pump when said valvemeans is open, a normally closed valve connected to said valve means andin the connection between said nozzle and said by-pass, and actuatingmeans connected to said pump outlet and to said valve means for openingsaid valve means and said valve in response to a predetermined pressurein the oil discharged by said pump.

References Cited in the file of this patent UNITED STATES PATENTS2,484,920 Witherell Oct. 18, 1949 2,494,714 Lyman Ian. 17, 19502,606,603 Witherell et a1 Aug. 12, 1952

